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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5126c9a626e2ba8575b88906ba9a77ae5a41c2e8cd8c10f048a128a89bde132e' 
  AND token = 'EkMeGYFvbTLQJQ+MgO9LZ/l7TT8jCl6M3f5wCnooIF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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