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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b66cfa4f155280f8f1b02ca5d097d3c1113590013de64f680827e20a0b214139' 
  AND token = 'Jsr1wzKHDnQbfsOMdHgxnWa7u11T/isEnjxbilc8jSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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