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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a5f1ecdb97ec098f76007764285e1b28bc604ef308a31751aff4d0411444d76' 
  AND token = 'wEzQ6K3S0F1OHKpbQNFvvfJO97TqauXN04oI8UuDGpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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