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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cab546c3c6a4e0374e4c64a5cf0635b7cdaae877c5cfcb6a2897237a44a1d8c' 
  AND token = 'fBk+y528B3Uawq3/SyyZYTSM8zXfzpEFqYvRgkBFVek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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