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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24c6be73d0abc7860db604c7e323aecdd904803d457bbda76726132d31c3bb37' 
  AND token = 'ae6JcBA1t3fio8vEm26NdrRxnHjSGLZrDavVps6IOSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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