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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f38e6acea7e99edd5cb40789b63e0262b4003f26606208594167426c03c35bbe' 
  AND token = 'zL6OGsgIvy57rz2SW6z4Ai1eTPSUp1tINVr3LHG+fs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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