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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bc28eb44a00d38af769a7e443b3c67373a480bf3596e112b9b06ec10987f3c7' 
  AND token = 'aaweg1I3ijF/H2HmIvmcGO0BzWCArxs2u20bMSQUP4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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