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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53a9696a94ee35f20ddb522ea620e4f67d36092f5e96f9f5dc5ce3af30b3b41a' 
  AND token = 'upDrLh5DQKW46hwL9UGHDn/hqOSkTdPiAijxHM9lSNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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