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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48c2f56c9cf8ae41fdf53cfe6a94c61a15bb2a1c16cbbe39a6fe92e3bec24ca' 
  AND token = 'it4LVm/gM7yBdiniF35qnKwlwzrsS0e8bKy+bnoyPsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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