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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be34a2ec2c256a41118eaf1c53c76c3895a5d7160eb395a6df74a6cb28a95fe1' 
  AND token = 'BhiL+mDNi4b2DtlkWMGqBrJBG4dObY7sPRpmcS1j5lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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