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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a42319d513664de4edc4a4fb87ff7da1ec1a0d26cc06598b676d52a38b18b00' 
  AND token = 'c13sMMxmEyZwotwXg/5EPZOIyajtVhoSqRvtrEPp26Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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