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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e4fa285e1f33c419adfb2da25d8ad045724b285b1ab0c288855dfe795156c64' 
  AND token = 'zZ7mF3Z2mhMt68E4hef+e2vgVsthzvQs4TTBoYlimAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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