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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c10e6d457e7becdade8345ffb3bfbc00c190da9a7c1509443a95b2187b55ce9' 
  AND token = 'Ir4yCJeE8gvgjfFEhxDHi5xzt7M1pw9RK3rnmD2X7uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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