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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efa2e2a638aa909c4fe1e6e6b78c277d1081faaf5819b38d2007bda6255875d4' 
  AND token = 'lLOze9rW3r+E7pJQxAZkbFW+mJI7lRhSSPhRQcGMoX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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