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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e99cebe5be45ad471299b62531f14c36ab6a85fd5c5d98c0c19cc8876bb25c' 
  AND token = 'WU77LMfxUVJ09Vz6ickiM3a4K6nDs5JS+YPkqs1aHbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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