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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26d8236dcd67bd95c02ffaff4c950348c9a30a19314d4d12c0c400ed886adbb7' 
  AND token = 'f+0pS1TCph69kypQNsZY+QSHJaZpOUEUO7nT39Hjiqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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