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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '606c031b138dc14be4276e9b5bfa3f5d89629eb2c29e668c3e289dcac59f9336' 
  AND token = 'MBXLdPTTaaSKE1kVlqO7+xzbhjBxvNftsPz0O9N2nnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}