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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fa970dd51073266160268e11aa6fe0dcbca2733d9c10fd7b7c37fcc367c1fd0' 
  AND token = '1OU4q/1r7aAv048ju9+DdhpBvS84591ruF+rA4oz+uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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