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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d80fd5ea0803ffa521a9a16661063ef468d48765cd530175aabcc5db7a86f91' 
  AND token = '401jdGTXFA2aqF5b7wJ9zoi6c7x5JkYOgco3F+Cscl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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