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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2528f25c9beb98ce11cce58fdba0ffc8f1e0df611d1834561f8012cbbbb82dfe' 
  AND token = 'BiLfdBJ9f4ZdmyIE6CXIwxCssCy2bknXVizzcJoEB0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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