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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b86e2fcb282424670bd29566f979991a7f0ade8c8733145fe02127c988fc99d8' 
  AND token = 'FecExT1CILuqwF1VHEnDnP8XdVu65jEpT6EeyUpNqLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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