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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eb1f6bf38681cb3d5133aa060b8a00aa2b26b6e0adf5badb9ff1ba1c94c6570' 
  AND token = '4S4+bTsp23GWEC3vNMZlAYzkFallUealkL3nz1Vb/Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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