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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae8e3538308529b40905bdf1684a2da595ce2766fac67390e6343d9ba77a4e59' 
  AND token = 'edAU3zjtk4r0GcXtCeYSobgnBPPRI4VyP52nqcUT/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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