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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '820776ac5774329c0ed0b6a04b8ec8a30fb1bc578bb9054bc4667648d3a31a89' 
  AND token = 'QOIDIktBh/XCMGASTikHCC7+TDidsxe9IuCmNDoxFMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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