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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caab5afb3e51a656cdcca894ee4d48d70e8ff707510954943abdd4842e9cc7e5' 
  AND token = '+89TOHK1JrzISeDB//gE3ReHzhh1Mn8BslTkrXkBoEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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