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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47835e9e1d0dfa2cfdc299fb5cdfc8615544227dc9049135efdbdc2fd609d37c' 
  AND token = 'n2WQZCtTIVxoKvsxf72iP6rckLIU+AvkNcO/RPbUkno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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