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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f0af9f9f0e27d9d0e8c2408e2639982ae8604324a5c7fc1385d9d365b75b4fb' 
  AND token = '87pTA2vsePyEalClQCPLVZ7QlgbiSydhCixz9BzYeno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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