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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbac3b34e7fb5992bab41d67916c4fcda19f9e807682b710794a7da626dc5753' 
  AND token = '0/Olh2Zby9tn6HCjXp0kL81bcCWesh3Rb/dnoFp9xxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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