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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a98c90d92cf115f1acdf8e0dd29410620747343d6b72d7de2a0ec76eadeeb7b3' 
  AND token = 'DJOi/Hbex23S9GMDp8qfTT9jbUbyyO+t4FGcByxRTbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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