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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4ca843c8bdb77dfb59dd57a8998043e7749afec7198bb341bcd67f02dd33f7e' 
  AND token = 'YoYDQE5J2t6OJ9sB5HH8FH++2tPfxTQ57Aeemn2LPpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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