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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89c9c7631874c93d4e4500b122e0d6aebc45c476d97cd7d1bf79cedf47a00150' 
  AND token = 'VCpqE8TiiEaifqIy2kQuaTVaPA/xooYAs7HGf9IhujY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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