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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d8eda944ff4dae03299468654d70a3f40e88556c8a0a1c800bf7d7d55f9d57' 
  AND token = 'jnAOLgjEwcj/FNLZPAd7b0+4RjLcDQ64DKvXI+ihyB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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