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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6602fa53a6ee0c6d372b648c3483335a1c92ec646a5732036451d642187a5e3' 
  AND token = 'eqRutmtQ5uqXrIBOr94jG+D6N7hnv68/X5b93Wu3zwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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