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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb48d72c411a079765601b6b93e927e599e04da8daed2fe5ce89f19fce6cd6a6' 
  AND token = 'xdqnvTGpFrKC/Mdp9HpW9QqjHvll9tYtXmii/H57tAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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