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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9a2187e1d62f6558063d85c23a9c00f1871bdafa2dd02e5ad97b70ae01227d5' 
  AND token = '2S2E88GPM1VG+cacGM9HU0sU/CjU/N1hM3uNIrwZyg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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