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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c7262f8a3fbd893c44b24b079b0706eff9688b6438cf319b8be84a00bb9a6e6' 
  AND token = '4FgWJqFSrAAwCqQL/UH+Cy8iFl1AmPHXecIda61CjzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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