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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e8004eb06d7825b91cf8581a067c3298111e027f915ca829034533fbdc9bb9e' 
  AND token = '/sxYP10pNXkxgmZlauD2JgcC5iJQm5YrLAG5kItpw9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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