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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe7894a5e04547fb9d22d5bef074e4a4bfa09491422545d173cf516332a9283a' 
  AND token = '3epPuAmtBHeOtNXIk9aVpbCWwwDXD+vwtWp0uY/2cnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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