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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18060aa7c3e18791461fad0d1d503cb72bdd64be615fbff5a1dea9da649a01ad' 
  AND token = 'SkejK9L+EdGZfAcKyJg5Np/J/MmVhvj5iXkzSIpR5HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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