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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e199ac0f0cff8f7695574fbfe62a1f2e7967c5ac460307b9b352607b223a103e' 
  AND token = 'PFX5lboYJV+fNXDDPT5tLjEt097ucUlyBzgjwSYSB2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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