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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d5bf097ed1556e14a1dd37a8c11228a429f727cac42982337b1eb9c7208d571' 
  AND token = 'sS7RNc9efqQG/adr4gbiR+nDkMd0H6JIeot4b9WTVxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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