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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3f67d2be2703cc6e855ab3c43542caef6efe74f7b9dafdfef3e3a7d3a8ad54d' 
  AND token = 'ppzi3YaoACUhpyZVtw7iDkjqcP9MBGlTTkOb0eqshek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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