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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98212d0a5c6f435c79469ccad795224e19c099e267290b8f7b90c72366a962ca' 
  AND token = 'fe0SvKYcL58t9/LwBQmf8cHNX4yEYsM3Gqb07zSPE/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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