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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ed238af76a0ac3861ccdfc6d59341ad2fdbd945210f9ba24454938b4edd6f3' 
  AND token = 'jS5fPwmYRAc9rDL8A5Ti2MfKen3zRwE5lfYSWCAGUe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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