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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aedca678d141d613acfa11cd84447719896cd9dfd45f710634c61c5be79fefc' 
  AND token = 'r1FAyWeWiTp32gsPXCc5/7euX3jwk5rlkFH0Q+Xz3Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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