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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '401b02bc17be47ac9b21073bfebedb641fa0afa9b3ebbe3e2475426a80648042' 
  AND token = 'v47MMXdoQaEOsyW1Z5R94ATBgh8bGSNF+otHOi4Z0NI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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