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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d2f0ed058a3b464fde67300a0c5b2e7802030aff2c919233dfa8982ecbb69f0' 
  AND token = 'kzn1XmfT1Dz9yY+f60Ex0NP+iJ1Xh6ca/czD8+d/mjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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