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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4c957dc101226624e7557550b2fab2b0a4b21be5245de3288a8204f470d19e8' 
  AND token = 'vrEAM2e/1iwNVPh9zoJMbs6kHtow8yx4Cg1xxmx2Byo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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