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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfc1cbc6971531a3a0f8698a41b51780bb07c4d260abd80d8de35e31f6d38be9' 
  AND token = 'EOzOseIkTbjoEvb4gEUIrqIDANsC43Jk6SLR7mc+ebE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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