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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ccbd9809963e6e0d7707fa8a7e847fae2f245d1d10d7cd704642d8006709481' 
  AND token = 'Wac5lC0kEU75DvIy+Vw8+0MnX84dLfTbUCGXPekn5to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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