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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53bac1c2301af1cfa1ae9e675f21949905e27bfcc8ad8cc6e7bdab9e6c42d0eb' 
  AND token = 'qR/lbrN3qYo14EMBzm/eLTl0z0TYiEqRm5Zmo6JkjoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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