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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ca0894502f302a78a2e21048fbf75097f49b78c49cc2c14c7e15e468e4e96b' 
  AND token = 'ItSuzGv7Pa2z6rHRXJWOUV4/H8634Ji8nMsO3bvdmbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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