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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2d0bbb788dc772a41d22faef8d242ce2071fe0c96af7fca5f78b820703efee4' 
  AND token = 'gq8BuuUmd6He5BoEOfy9r7JNSprxbw6T3ZMARojJJ7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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