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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e0b6f257744ad53d8d1acfd4256ab038fb41511bbf4f12712c3eb6115754b7c' 
  AND token = 'OJvGwa+6nu/DSigby2pdT2Qe2Z+0fVGdgrIesw+BceQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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