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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd88bd2e5812320137026881001e55deba7d1dadd4f69411819d3e1b3c1c767a' 
  AND token = 'yr+ZQ6+NwArN8BP13SzegJy6VfYTovg3LFg0U+gMtI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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