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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aa402d533afa3b67b69ab36ebc9743093b3f1b1fdd6260fa348b10bca9f4f87' 
  AND token = '+dUbbdxgE0WesnCr5nnjUXKBSRgkkLDRAaRqIi3hCo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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